Global InformationGamma Columbae information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 57m 32.20958s[1] |
| Declination | −35° 16′ 59.8153″[1] |
| Apparent magnitude (V) | 4.366 + 12.664[2] |
| Characteristics | |
| Spectral type | B2.5 IV[3] + G8 V[4] |
| U−B color index | −0.66[5] |
| B−V color index | −0.18[5] |
| Variable type | Candidate SPB[6] |
| Astrometry | |
| Radial velocity (Rv) | +24.2[7] km/s |
| Proper motion (μ) | RA: −3.24[1] mas/yr Dec.: +10.21[1] mas/yr |
| Parallax (π) | 3.75 ± 0.18 mas[1] |
| Distance | 870 ± 40 ly (270 ± 10 pc) |
| Absolute magnitude (MV) | −2.76[8] |
| Details[6] | |
| γ Col A | |
| Mass | 5.7±0.3 M☉ |
| Radius | 4.8±0.4 R☉ |
| Luminosity | 2,070[9] L☉ |
| Surface gravity (log g) | 3.328±0.100[10] cgs |
| Temperature | 15570±320[10] K |
| Rotational velocity (v sin i) | 96±16 km/s |
| Age | 23.6±2.0[11] Myr |
| γ Col B | |
| Mass | 0.94[2] M☉ |
| Temperature | 5,367[2] K |
| Other designations | |
γ Col, CD−35°2612, HD 40494, HIP 28199, HR 2106, SAO 196352.[12] | |
| Database references | |
| SIMBAD | data |
Gamma Columbae, Latinized from γ Columbae, is a possible wide binary star system[2] in the southern constellation of Columba. It is visible to the naked eye with an apparent visual magnitude of 4.36.[5] Based upon an annual parallax shift of 3.75 mas,[1] it is located roughly 870 light years from the Sun.
The primary component is an evolved[6] B-type subgiant star with a stellar classification of B2.5 IV.[3] It is a candidate slowly pulsating B-type star with a mean longitudinal magnetic field strength of 94±28 G.[6] The star has nearly six times the mass of the Sun and close to five times the Sun's girth.[6] It is radiating over 2,000 times the solar luminosity from its outer atmosphere at an effective temperature of 12,904 K.[9] The estimated age of this star is around 24 million years.[11] At this age, it is thought to be the remnant of a once more massive star that just finished hydrogen fusion, and is undergoing structural readjustment. This process is extremely short, on the order of ten thousand years, making it a rare object.[10]
The visual magnitude 12.664[2] companion is a G-type main sequence star with a classification of G8 V.[4] It lies at an angular separation of 33.8 arc seconds from the primary, which corresponds to a projected physical separation of 8,844 AU.[2] Despite the young age of these stars, there has been no X-ray emission detected.[2]
- ^ a b c d e f Cite error: The named reference
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Anderson2012was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Mcdonald2012was invoked but never defined (see the help page). - ^ a b c Irrgang, Andreas; Przybilla, Norbert; Meynet, Georges (2022). "γ Columbae as a recently stripped pulsating core of a massive star". Nature Astronomy. 6 (12): 1414–1420. arXiv:2211.00358. Bibcode:2022NatAs...6.1414I. doi:10.1038/s41550-022-01809-6. S2CID 253244604.
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